c:stdio.h:vfscanf
Differences
This shows you the differences between two versions of the page.
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c:stdio.h:vfscanf [2013/02/03 19:11] 127.0.0.1 external edit |
c:stdio.h:vfscanf [2024/02/16 01:05] (current) |
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| ====== vfscanf ====== | ====== vfscanf ====== | ||
| <code c> | <code c> | ||
| + | int vfscanf ( FILE * stream, const char * format, va_list arg ); | ||
| </code> | </code> | ||
| ==== description of vfscanf ==== | ==== description of vfscanf ==== | ||
| - | vfscanf is in work by code-reference.com \\ | + | The vscanf(), vfscanf(), and vsscanf() functions shall be equivalent to the scanf(), fscanf(), and sscanf() functions, respectively, except that instead of being called with a variable number of arguments, they are called with an argument list as defined in the <stdarg.h> header. These functions shall not invoke the va_end macro. As these functions invoke the va_arg macro, the value of ap after the return is unspecified. |
| - | if you are faster... don't hasitate and add it | + | |
| <code c> | <code c> | ||
| - | no example at the moment | + | #include <stdio.h> |
| + | #include <stdlib.h> | ||
| + | #include <stdarg.h> | ||
| + | |||
| + | FILE *fp; | ||
| + | |||
| + | int my_vfscanf(char *fmt, ...) | ||
| + | { | ||
| + | va_list argptr; | ||
| + | int cnt; | ||
| + | |||
| + | va_start(argptr, fmt); | ||
| + | cnt = vfscanf(fp, fmt, argptr); | ||
| + | va_end(argptr); | ||
| + | return(cnt); | ||
| + | } | ||
| + | |||
| + | int main(void) | ||
| + | { | ||
| + | int inumber = 6; | ||
| + | float fnumber = 7.0; | ||
| + | char string[30] = "hoopy frood"; | ||
| + | |||
| + | fp = tmpfile(); | ||
| + | if (fp == NULL) | ||
| + | { | ||
| + | perror("tmpfile() call"); | ||
| + | exit(1); | ||
| + | } | ||
| + | |||
| + | fprintf(fp,"%d %f %s\n",inumber,fnumber,string); | ||
| + | rewind(fp); | ||
| + | |||
| + | my_vfscanf("%d %f %s", &inumber, &fnumber, string); | ||
| + | printf("%d * %f = %s\n", inumber, fnumber, string); | ||
| + | fclose(fp); | ||
| + | |||
| + | return 0; | ||
| + | } | ||
| </code> | </code> | ||
| ===== output of vfscanf c example ===== | ===== output of vfscanf c example ===== | ||
| - | no example at the moment | + | 6 * 7.000000 = hoopy |
on the occasion of the current invasion of Russia in Ukraine
c/stdio.h/vfscanf.1359915101.txt · Last modified: 2024/02/16 01:03 (external edit)
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